package ${package.Stereotype}.util;

import org.apache.tomcat.util.codec.binary.Base64;
import ${package.Stereotype}.security.bean.AbstractKeyPair;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import javax.crypto.Cipher;
import java.security.KeyFactory;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

@Component
public class RSAUtils {

    @Resource
    AbstractKeyPair abstractKeyPair;

    /**
     * RSA公钥加密
     *
     * @param str
     *            加密字符串
     *            公钥
     * @return 密文
     * @throws Exception
     *             加密过程中的异常信息
     */
    public String encrypt( String str ) throws Exception{
        //base64编码的公钥
        byte[] decoded = Base64.decodeBase64(abstractKeyPair.getPublicKey());
        RSAPublicKey pubKey = (RSAPublicKey) KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(decoded));
        //RSA加密
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, pubKey);
        String outStr = Base64.encodeBase64String(cipher.doFinal(str.getBytes("UTF-8")));
        return outStr;
    }

    /**
     * RSA私钥解密
     *
     * @param str
     *            加密字符串
     * @return 铭文
     * @throws Exception
     *             解密过程中的异常信息
     */
    public  String decrypt(String str) {
        try {
            //64位解码加密后的字符串
            byte[] inputByte = Base64.decodeBase64(str.getBytes("UTF-8"));
            //base64编码的私钥
            byte[] decoded = Base64.decodeBase64(abstractKeyPair.getPrivateKey());
            RSAPrivateKey priKey = (RSAPrivateKey) KeyFactory.getInstance("RSA").generatePrivate(new PKCS8EncodedKeySpec(decoded));
            //RSA解密
            Cipher cipher = Cipher.getInstance("RSA");
            cipher.init(Cipher.DECRYPT_MODE, priKey);
            String outStr = new String(cipher.doFinal(inputByte));
            return outStr;
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;
    }

    public static void main(String[] args) throws Exception {
        //		String presentedPassword = "Qw123456@";
        //		// 这里是传入校验的密码
        //		System.out.println(encrypt(presentedPassword));
        //		PasswordEncoder encode  = new BCryptPasswordEncoder();
        //		String bc = encode.encode(presentedPassword);
        //		// 这里是数据库里面的密码
        //		System.out.println("数据库里面保存的密码..........");
        //		System.out.println(bc);
    }
}
